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antop-dev/PagingTag.java

Created July 21, 2019 08:01
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Revisions

  1. antop-dev created this gist Jul 21, 2019.
    182 changes: 182 additions & 0 deletions PagingTag.java
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,182 @@
    import org.apache.taglibs.standard.tag.common.core.ParamParent;
    import org.apache.taglibs.standard.tag.common.core.ParamSupport;
    import org.apache.taglibs.standard.tag.common.core.UrlSupport;

    import javax.servlet.jsp.JspException;
    import javax.servlet.jsp.JspTagException;
    import javax.servlet.jsp.tagext.BodyTagSupport;
    import java.io.IOException;

    public class PagingTag extends BodyTagSupport implements ParamParent {

    private String url;
    private String context;
    private ParamSupport.ParamManager params;

    private int page;
    private int pageSize = 10;
    private int blockSize = 10;
    private int total;

    private String firstWord;
    private String previousWord;
    private String nextWord;
    private String lastWord;

    private boolean addedParameter = false;

    public PagingTag() {
    super();
    init();
    }

    private void init() {
    url = null;
    params = null;
    page = 1;
    pageSize = 10;
    blockSize = 10;
    total = 0;

    firstWord = "처음";
    previousWord = "이전";
    nextWord = "다음";
    lastWord = "마지막";
    }

    @Override
    public int doStartTag() throws JspException {
    params = new ParamSupport.ParamManager();
    return EVAL_BODY_BUFFERED;
    }

    @Override
    public int doEndTag() throws JspException {
    if (total == 0 || pageSize == 0) {
    return EVAL_PAGE;
    }

    // System.out.println("page = " + page);
    // System.out.println("pageSize = " + pageSize);
    // System.out.println("blockSize = " + blockSize);
    // System.out.println("total = " + total);

    int startBlock = ((page - 1) / blockSize) * blockSize + 1;
    int endBlock = startBlock + blockSize - 1;
    int totalBlock = total / pageSize;
    if (total % pageSize > 0) {
    totalBlock++;
    }

    if (endBlock > totalBlock) {
    endBlock = totalBlock;
    }

    // System.out.println("startBlock = " + startBlock);
    // System.out.println("totalBlock = " + totalBlock);
    // System.out.println("endBlock = " + endBlock);

    String baseUrl = UrlSupport.resolveUrl(this.url, context, pageContext);
    baseUrl = params.aggregateParams(baseUrl);

    // System.out.println("baseUrl = " + baseUrl);

    StringBuffer sb = new StringBuffer();
    sb.append("<div class=\"page_nav\">");
    sb.append(" <ul class=\"clearfix\">");

    if (page - 1 > 1) {
    sb.append("<li class=\"dis first\"><a href=\"" + makePagingUrl(baseUrl, 1) + "\">" + firstWord + "</a></li>");
    }
    if (page > blockSize) {
    sb.append("<li class=\"dis prev\"><a href=\"" + makePagingUrl(baseUrl, startBlock - 1) + "\">" + previousWord + "</a></li>");
    }

    for (int i = startBlock ; i <= endBlock; i++) {
    sb.append("<li ");
    if (i == page) {
    sb.append(" class=\"on\"");
    }
    sb.append(">");
    sb.append("<a href=\"");
    sb.append(makePagingUrl(baseUrl, i));
    sb.append("\">");
    sb.append(i);
    sb.append("</a>");
    sb.append("</li>");
    }

    if (startBlock + blockSize < totalBlock) {
    sb.append("<li class=\"dis next\"><a href=\"" + makePagingUrl(baseUrl, startBlock + blockSize) + "\">" + nextWord + "</a></li>");
    }
    if (page < totalBlock) {
    sb.append("<li class=\"dis last\"><a href=\"" + makePagingUrl(baseUrl, totalBlock) + "\">" + lastWord + "</a></li>");
    }

    sb.append(" </ul>");
    sb.append("</div>");

    try {
    pageContext.getOut().print(sb.toString());
    } catch (IOException e) {
    throw new JspTagException(e);
    }

    return EVAL_PAGE;
    }

    private String makePagingUrl(String baseUrl, int page) {
    return baseUrl + (addedParameter ? "&" : "?") + "page=" + page;
    }

    public void release() {
    init();
    }

    @Override
    public void addParameter(String name, String value) {
    params.addParameter(name, value);
    addedParameter = true;
    }

    public void setUrl(String url) {
    this.url = url;
    }

    public void setContext(String context) {
    this.context = context;
    }

    public void setPage(int page) {
    this.page = page;
    }

    public void setPageSize(int pageSize) {
    this.pageSize = pageSize;
    }

    public void setBlockSize(int blockSize) {
    this.blockSize = blockSize;
    }

    public void setTotal(int total) {
    this.total = total;
    }

    public void setFirstWord(String firstWord) {
    this.firstWord = firstWord;
    }

    public void setPreviousWord(String previousWord) {
    this.previousWord = previousWord;
    }

    public void setNextWord(String nextWord) {
    this.nextWord = nextWord;
    }

    public void setLastWord(String lastWord) {
    this.lastWord = lastWord;
    }

    }